CN106717116A - Switched mode power converter circuit and method - Google Patents
Switched mode power converter circuit and method Download PDFInfo
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- CN106717116A CN106717116A CN201580044296.XA CN201580044296A CN106717116A CN 106717116 A CN106717116 A CN 106717116A CN 201580044296 A CN201580044296 A CN 201580044296A CN 106717116 A CN106717116 A CN 106717116A
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Classifications
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
- H05B45/3725—Switched mode power supply [SMPS]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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Abstract
A switched mode power converter circuit, comprising: an energy storing inductor (L1) coupled to the power supply and being charged by said power supply or discharge to power a load; a power switch (Q1) adapted to switch on and off to set said energy storing inductor to be charged or discharge;a further inductor (L2) coupled between a current output terminal of the power switch and a ground terminal, the further inductor being magnetically coupled with the energy storing inductor, wherein the further inductor is configured to apply a positive feed to the power switch as the energy storing inductor begins to be charged, thereby accelerating a switching on of the power switch; a sensing resistor (R3) coupled in series with the further inductor between the current output terminal of the power switch and the ground terminal; and a capacitor (C4) coupled between a control terminal of the power switch and the ground terminal, and between the power supply and the ground terminal.
Description
Technical field
Present invention relates in general to be used for based on light emitting diode illumination switched mode power converter circuit and
Method, and it is especially compatible with the lighting engineering based on variable input voltage.This conception of species is applied not only to LED illumination, and
It is additionally operable to the other application of industrial power, consumption electronic products etc..
Background technology
In the present description and claims, term " LED " will be used to representing organic and inorganic light-emitting diode (LED),
And present invention could apply to both classifications.LED is that electric current drives lighting unit.They using by expectation electric current transmit to
The LED driver of LED is driven.
The requirement electric current being provided changes for different lighting unit and for the different configurations of lighting unit.Most
New LED driver is configured to have enough flexibilities to make them can be used for difference lighting unit and use on a large scale
In a series of many lighting units.
The switched-mode power supply circuit of such as step-down controller circuit is widely used as light-emitting diodes due to its low cost
Pipe (LED) drive circuit and charger.Switched-mode power supply circuit sets or realizes energy using power or controlling switch
Storage inductor is charged or discharged.Power or controlling switch are generally implemented by the transistor of MOSFET or similar techniques.
It is well known, however, that compared with mosfet transistor drive circuit, bipolar transistor and bipolar transistor drive circuit thus
Generally implement less expensive.For inexpensive switched-mode power supply circuit, gate-controlled switch is embodied as in converter
Bipolar transistor can be a kind of improvement.It is well known, however, that bipolar transistor switches are in switching frequency and effect frequency (effect
Frequency) aspect has limitation.These limitations are the results of the operation ' region ' of transistor switch.In saturation ' region ',
When bipolar transistor is fully on, the base stage of bipolar transistor has ' excessive charge ', and this needs can perform transistor
Closing before be removed.This excessive charge removal cycle creates ' storage time ', which has limited the switching frequency of circuit
With effect efficiency.
Typically, it is desirable to which adjunct circuit controls the base current of bipolar transistor to accelerate it to close.Reference picture 1 shows
This example, Fig. 1 shows the bipolar transistor configuration of transmitting driver.Emitter stage drive circuit includes that high-voltage bipolar is brilliant
Body pipe Q1.High-voltage power bipolar transistor Q1 is coupled to current potential or supply voltage Vb at transistor Q1 base terminals via resistor Rb
The first terminal.Emitter circuit also includes low pressure and low power MOSFET M1.MOSFET M1 cascade coupleds are to bipolar transistor Q1.
MOSFET is also controlled by gate G terminal input.In the example illustrated in figure 1, MOSFET M1 are coupled to bipolar transistor Q1's
The Second terminal of emitter stage and supply voltage Vb.
The switch of the circuit is controlled by MOSFET M1.When MOSFET is turned on, bipolar transistor is also switched on, because
Voltage source transmission base current in the base stage of bipolar transistor.It is double due to the interruption of emitter current when MOSFET is closed
Gated transistors are closed.Excess minority carriers in the down periods of bipolar transistor, the base stage of bipolar transistor are rapidly
Evacuate or clean to the colelctor electrode of bipolar transistor.This evacuation or cleaning of minority carrier cause improved closing treatment simultaneously
Allow switching frequency higher.
Although not shown in Fig. 1, this configuration also requires that circuit produces burning voltage at the base stage of bipolar transistor,
And also require that circuit produces the driver signal for mosfet transistor.In other words, all emitter stages as shown in Figure 1 drive
The configuration of dynamic device bipolar transistor is relative to the simple double-pole switch a considerable amount of additional components of requirement.
WO 9811659A1 disclose a kind of circuit, and it is that self-oscillation ratio drives converter.It includes that being connected to master opens
The winding of the base stage of pass provides the driving current with main switch current in proportion, and sensing electricity including being connected with main switch
Resistance device, main switch activation latch cicuit closes it to draw electric current from the base stage of main switch.
The content of the invention
Although improving the performance of bipolar driver circuit, the type of all drive circuits described above is in cost sensitivity
There is problem in application aspect, because it requires additional component or integrated circuit area.Further, since bipolar transistor and
MOSFET is used for this drive circuit, so demonstrably：Cost very little, and will not be likely larger than known
Mosfet driver circuit.
Above mentioned problem is solved by inventing as defined by the appended claims.The very basic of embodiments of the invention is thought
Method be by with power source path in armature winding magnetic couplings auxiliary or AUX windings be connected to the current output terminal of power switch
Son.When on converter activation or conducting and armature winding voltage change when, current output terminal from AUX windings to power switch
Apply induced voltage as feeding, thereby speed up power switch activation or turn on.
According to one embodiment of present invention, there is provided a kind of switched mode power converter circuit, including：Energy stores
Inductor, coupled to power supply, and by the power source charges or is discharged come to load supplying；Power switch, is suitable to
It is turned on and off setting the energy stores inductor charge or discharge；Another inductor, is coupling in the electric current of power switch
Between lead-out terminal and ground terminal, another inductor and energy stores inductor magnetic couplings, wherein, another inductor is matched somebody with somebody
Be set to energy stores inductor start to charge up come to power switch apply just feed so that accelerating power switch conducting；
Sense resistor, with another inductor series coupled between the current output terminal and ground terminal of power switch；And electricity
Container, is coupling between the control terminal of power switch and ground terminal, and between power supply and ground terminal.
In such an embodiment, power switch just feed generate bipolar transistor faster or accelerate conducting, because
This improves the performance of drive circuit in terms of the switching frequency of bipolar transistor and improvement conducting.
It can be first voltage just to feed.
Sense resistor can be configured as providing second voltage to resist first voltage to current output terminal.The implementation
The advantage of example is that sense resistor provides negative-feedback according to power switch electric current to power switch, and thus electric current can be adjusted
Save and converge.
Capacitor can be configured as being electrically charged during the conducting of power switch, and further speed up power switch
Conducting.The advantage of the embodiment is the switching speed for further increasing highway speeds.
Energy stores inductor can be configured as when power switch is turned in inductor internal memory energy storage capacity, and in power
Release stored energy when switch is closed, another inductor can be further configured to discharge energy with energy stores inductor
Amount is fed to apply to bear to power switch, so as to strengthen the closing of power switch.Advantage of this embodiment is that, it is ensured that power is opened
The closing of pass simultaneously avoids leakage.
Negative feeding can be applied to another voltage of power switch.
Power switch can be bipolar transistor, and the current output terminal of power switch can be the transmitting of bipolar transistor
Pole, and power switch control terminal can be bipolar transistor base terminal.
First voltage can be applied to the negative voltage of the current output terminal of power switch, and wherein power switch is NPN
Bipolar transistor.
First voltage can be applied to the positive voltage of the current output terminal of power switch, and wherein power switch is PNP
Bipolar transistor.
In the case where power switch is npn bipolar transistor, second voltage can be positive voltage, and second voltage can inhale
Attract the closing that the negative electrical charge of the control terminal from power switch is switched with accelerating power.
In the case where power switch is PNP bipolar transistor, second voltage can be negative voltage, and second voltage can inhale
Attract the closing that the positive charge of the control terminal from power switch is switched with accelerating power.
In the case where power switch is npn bipolar transistor, another voltage can be applied to the positive electricity of power switch
Pressure.
In the case where power switch is PNP bipolar transistor, another voltage can be applied to the negative electricity of power switch
Pressure.
Switched mode power converter can be step-down converter, and energy stores inductor can be coupled in series in power and open
Close and load between, fly-wheel diode can be coupling between energy stores inductor and load, with when power switch is closed
Energy to being discharged from energy stores inductor carries out afterflow, and capacitor can be coupled to via load and current-limit resistor
Power supply.
Power switch can be NPN transistor, and another inductor can be in inflow or just or with coupling at point terminal
To power switch emitter stage and at outflow or negative terminal coupled to the first terminal of sense resistor, another inductor and energy
Amount storage inductor magnetic couplings so that outflow or negative terminal of the inflow terminal of another inductor near energy stores inductor
Son, and the outflow terminal of another inductor is close to the inflow of energy stores inductor or just or with point terminal.
Switched mode power converter circuit can also include the electric discharge branch in parallel with the capacitor, in power
Switch allows the capacitor discharge when closing.
In the way of to form boosting, buck-boost or flyback converter, energy stores inductor can with power switch and
Light-emitting diode component is coupled.
A kind of lighting circuit can include：Such as the switched mode power converter circuit being characterized herein；And luminous two
Pole pipe is arranged, coupled to switched mode power converter circuit.In another embodiment, lighting circuit may further include horizontal stroke
Across the smoothing capacity device of light emitting diode arrangement.
According to second aspect, there is provided it is a kind of using switched mode power converter circuit come the method for driving current, the party
Method includes：Energy stores inductor is coupled to power supply, the energy stores inductor is by the power source charges or electric discharge
Come to load supplying；Power switch is turned on and off, to cause the energy stores inductor charge or discharge；In power switch
Current output terminal and ground terminal between couple another inductor；By another inductor and energy stores inductor magnetic coupling
Close, wherein, another inductor is configured as being started to charge up with energy stores inductor applying just to feed to power switch, from
And the conducting of accelerating power switch.In such an embodiment, power switch just feed generate bipolar transistor faster or
The conducting of acceleration, therefore the performance of drive circuit is improve in terms of the switching frequency of bipolar transistor and improvement conducting.
It can be first voltage just to feed.
The method can be further included：By sense resistor between the current output terminal and ground terminal of power switch
Coupled in series with another inductor.The method can include：Second voltage is provided from sense resistor to current output terminal
To resist first voltage.
The method can be further included：Between the control terminal and ground terminal of power switch and in power supply and ground connection
Coupled capacitor device between terminal.The method can include：Capacitor is charged during the conducting of power switch, and is entered
The conducting of one step accelerating power switch.
The method may include：When power switch is turned in inductor internal memory energy storage capacity, and when power switch is closed
The stored energy of release.The method is further included：As energy stores inductor releases energy, from another inductor to work(
Rate switch is provided to bear and fed, so as to strengthen the closing of power switch.
There is provided negative feeding can include applying another voltage to power switch.
Power switch can be bipolar transistor, and the current output terminal of power switch can be the transmitting of bipolar transistor
Pole, and power switch control terminal can be bipolar transistor base terminal.
Applying first voltage can include：Apply negative voltage, wherein power switch to the current output terminal of power switch
It is npn bipolar transistor.
Applying first voltage can include：Apply positive voltage, wherein power switch to the current output terminal of power switch
It is PNP bipolar transistor.
In the case where power switch is npn bipolar transistor, applying second voltage can include applying positive voltage so that
Second voltage can attract the closing that the negative electrical charge of the control terminal from power switch is switched with accelerating power.
In the case where power switch is PNP bipolar transistor, applying second voltage can include applying negative voltage so that
Second voltage can attract the closing that the positive charge of the control terminal from power switch is switched with accelerating power.
It is that in the case that NPN is bipolar transistor, applying another voltage can include being applied to power switch in power switch
Plus positive voltage.
In the case where power switch is PNP bipolar transistor, applying another voltage can include applying to power switch
Negative voltage.
Switched mode power converter circuit can be step-down converter.The method may include：In power switch and load
Between couple energy stores inductor in series.The method can include：Coupling is continuous between energy stores inductor and load
Stream diode, afterflow is carried out with the energy when power switch is closed to being discharged from energy stores inductor.The method can be wrapped
Include：Capacitor is coupled to power supply via load and current-limit resistor.
Power switch can be NPN transistor, and the method can include：Will be separately at inflow or negative or band point terminal
One inductor is coupled to the emitter stage of power switch, and another inductor is coupled into sensing resistance at outflow or negative terminal
The first terminal of device.The method can include：Make another inductor and energy stores inductor magnetic couplings so that another inductance
Device flows into terminal near the outflow of energy stores inductor or negative terminal, and another inductor outflow terminal is near energy stores electricity
Sensor is flowed into or just or with point terminal.
The method can include：The electric discharge branch in parallel with the capacitor is provided, for permitting when power switch is closed
Perhaps capacitor discharge.
The method can include：Energy stores inductor is set to be coupled with power switch and light-emitting diode component, to be formed
One kind in boost converter, bust-boost converter or flyback converter.
These and other aspects of the invention will become apparent and be explained with reference to the embodiments described below
State.
Brief description of the drawings
Example of the invention is described in detail now with reference to accompanying drawing, wherein：
Fig. 1 shows the LED driver circuit in exemplary prior art；
Fig. 2 shows the exemplary LED driver circuit according to some embodiments；And
Fig. 3 shows the current waveform of exemplary LED driver circuit.
Specific embodiment
Embodiment described herein there is provided a kind of switched mode power converter circuit, it is used to be suitable for driving to light
The drive circuit of diode arrangement.Drive circuit described herein includes the input for receiving input power.Drive circuit
Switched mode power converter circuit including being configured to supply the driving current from input.As described herein, open
Closing mode power converter circuit includes energy stores inductor, and it is coupled to power supply and can be configured to power supply and fills
Electricity or electric discharge to be load (such as LED module) power supply.Drive circuit can also include controllable or power switch, and it is configured
Be by be adapted to turn on and turn off with by energy stores inductor be set to charge or discharge come controlling switch mode power change
Device.
Features described below is by npn bipolar transistor property power switch as an example.Therefore, it is described below
In, the control terminal of power switch is the base stage of transistor, and the current input terminal of power switch is the colelctor electrode of transistor, with
And the current output terminal of power switch is the emitter stage of transistor.It is to be appreciated, however, that can in the examples below using real
Any appropriate power switch or element of the function of now switching.For example, in the examples below, power switch is PNP bipolar
Transistor rather than npn bipolar transistor described herein, they have appropriate difference in terms of circuit configuration.
Drive circuit may further include and be coupling between the current output terminal of power switch and ground terminal
Another or inductor of feeding.Another inductor can be with energy stores inductor magnetic couplings.In other words, another electricity is configured
Sensor and energy stores inductor so that the magnetic field of energy stores inductor can influence another inductor.Another inductor can
Configured with (positive feed) applying that will just be fed as energy stores inductor is started to charge up with as described herein
To power switch.Just feeding can be with the conducting of accelerating power switch.
Drive circuit can further include with it is another between the current output terminal and ground terminal of power switch
The sense resistor of inductor series coupled.
Drive circuit can also include the capacitor being coupling between the control terminal of power switch and ground terminal, and
And be further coupling between power supply and ground terminal.
Energy stores inductor can be configured as when power switch is turned in inductor internal memory energy storage capacity and in work(
Release stored energy when rate switch is closed.Another or inductor of feeding further detailed herein is further configured
It is that negative feeding is supplied to power switch as energy stores inductor is released energy, so as to strengthen the closing of power switch.
Negative feeding can be available to another voltage of power switch.
In described example, it can be first voltage just to feed.First voltage can be applied to power switch
The negative voltage of current output terminal, wherein power switch are npn bipolar transistors.Similarly, first voltage can be applied to
The positive voltage of the current output terminal of power switch, wherein power switch are PNP bipolar transistors.Negative feeding can be the second electricity
Pressure.In the case where power switch is npn bipolar transistor, second voltage can be positive voltage, and second voltage attracts to come from work(
The closing that any negative electrical charge of the control terminal of rate switch is switched with accelerating power.It is PNP bipolar transistor in power switch
In the case of, second voltage can be negative voltage, and second voltage attracts the positive charge of the control terminal from power switch to accelerate
The closing of power switch.In the case where power switch is npn bipolar transistor, another voltage can be applied to power switch
Positive voltage, and in the case where power switch is PNP bipolar transistor, another voltage can be applied to the negative of power switch
Voltage.
It should be understood that switched mode power converter described herein includes step-down converter.However, it is possible to use with this
The text similar teaching uses any appropriate switched mode power converter circuit.For example, boosting, buck-boost and
Flyback converter can be implemented herein in regard to the teaching described by step-down converter.
Fig. 2 shows that the exemplary buck converter switch mode power for the part for being embodied as LED driver circuit turns
Converter circuit.Exemplary driver circuits include exchange (such as 230V or 115V) source V1, and it is configured as in Differential Input 1,3
Place is provided, and it can be rectified (or filtering) and provide appropriate height and low potential with to switched mode power converter circuit
Input.Alternating current source can be city's power supply.
Exchange or city's power supply can be rectified (or filtering) to be formed coupled to the suitable of switched mode power converter circuit
When high and low potential input (commutating DC or D/C power, also known as Vbus).In the example illustrated in figure 1, exemplary driver
Device circuit implements rectifier using diode rectifier or bridge (D1, D2, D3, D4), its generation full-wave rectification output.Fig. 2 shows
Go out：First diode D1, its negative electrode is coupled to the first Differential Input 1, and anode is exported coupled to the first rectification；Two or two
Pole pipe D2, its negative electrode is exported coupled to the second rectification, and anode is coupled to the first Differential Input 1；3rd diode D3, it is cloudy
Pole is coupled to the second Differential Input 3, and anode is exported coupled to the first rectification；And the 4th diode D4, the coupling of its negative electrode
The second Differential Input 3 is coupled to the second rectification output, and anode.However, it is possible to using any other appropriate rectifier
Or configuration.
Additionally, in certain embodiments, the output of rectifier can be before switched mode power converter be transferred to
Filtered or buffered.Wave filter or buffer shown in Fig. 2 use input capacitor C1, the capacitor to be coupling in diode rectification
Between the first and second rectifications output of device.In certain embodiments, input capacitor C1 is 100nF capacitors.Wave filter or
Buffer further includes filter inductor L3, and the first rectification output that it is coupling in diode rectifier is input into high potential
(Vbus) between.Inductor L3 can be 2.2mH inductors.Wave filter further includes the electricity in parallel with filter inductor L3
Resistance device R1, in other words, resistor R1 be coupling in the first rectification output of diode rectifier and high potential input (Vbus) it
Between.Filter resistors R1 can be 4.7k Ω resistors.Wave filter can further include output capacitor C2, capacitor C2
It is coupling between high potential input (Vbus) and the second rectification output of diode rectifier.In certain embodiments, diode
Second rectification output coupling of rectifier to ground connection or ground is input into forming the low potential of switched mode power converter.Output electricity
Container C2 can be 100nF capacitors.
Drive circuit further includes switched mode power converter (being in the circuit buck converter section 7),
Input power is converted to appropriate driving current come for LED (being shown by D7 in Fig. 2) powers by it.In certain embodiments, open
Closing mode power converter includes the npn bipolar transistor Q1 for being coupled by first network and being biased.First network or electric discharge point
Branch includes connecting and being coupling in the diode D6 and resistor R4 between the base stage of transistor Q1 and low potential input.In Fig. 1 institutes
In the example shown, resistor R4 is coupling between the base stage of the anode of diode D6 and transistor Q1, and diode D6 the moon
Pole is input into coupled to low potential.Resistor R4 can be 100 Ω resistors, and diode D6 can be 1N4148 diodes.
Converter further includes start-up capacitance device C4.Start-up capacitance device C4 and first network parallel coupled.In other words,
Start-up capacitance device C4 can be coupling between the base stage of transistor Q1 and low potential input.Start-up capacitance device C4 can be 47nF electricity
Container.As defined in its name, the function of start-up capacitance device C4 is that, for starting transistor Q1, this will carried out in detail below
Discuss.
Converter can further include startup resistor R2.Startup resistor R2 can be coupling in the base stage of transistor Q1 with
Between LED module terminal.Startup resistor R2 can be 100k Ω resistors.Alternatively, startup resistor R2 can be coupled
To wave filter or buffer, i.e., coupled to Vbus.
Converter can further include load capacitor C3.Load capacitor can be coupling in high potential input (Vbus) with
Between LED module terminal.Load capacitor C3 can be 100 μ F capacitors.The function of load capacitor C3 is smooth being supplied to
The power of LED D7.
Converter can further include load or LED module, and it is coupling in high potential input (Vbus) and LED module terminal
Between.In other words, load or LED module are in parallel with load capacitor C3.The load of LED module can include the string of LED D7
Networking network, wherein, the negative electrode of LED D7 is coupled to LED voltage source (Vled) coupled to high potential input (Vbus), and anode.
LED module may further include the LED voltage source (Vled) being coupling between the anode of LED and LED module terminal.
Converter can further include energy stores inductor L1.Energy stores inductor L1 can be coupling in LED module
Between the colelctor electrode (C) of terminal and transistor Q1.Energy stores inductor L1 can be 2.4mH inductors.
Converter can further include sustained diode 5.Sustained diode 5 can further be coupling in high potential input
(Vbus) and the colelctor electrode (C) of transistor Q1 between, wherein, diode anode is input into coupled to high potential.Sustained diode 5
Can be UPSC600 diodes.
Converter can further include to be coupled in series in another between the emitter stage of transistor Q1 and low potential input or
Feed inductor L2 and sense resistor R3.The inductor L2 that feeds can be coupling in the emitter stage of transistor Q (E) with sensing resistance
Between the first terminal of device R3.In the case where bipolar transistor is NPN transistor shown in Fig. 1, inductor of feeding can have
The outflow terminal of the inflow terminal coupled to the emitter stage of transistor and the first terminal coupled to sense resistor.Sensing electricity
Resistance device can further be coupling in feeds between inductor L2 and low potential input.The inductor L2 that feeds can be 3.3 μ H inductance
Device, and energy stores inductor L1 can be magnetically coupled to, by this way so that inductor of feeding flows into terminal near coupling
The energy stores inductor outflow terminal of LED module terminal, and inductor outflow terminal of feeding are bonded near coupled to crystal
The energy stores inductor of the colelctor electrode of pipe flows into terminal.Sense resistor R3 can be 8.2 Ω resistors.
The operation of described converter is as follows.
The initial start of converter is provided by startup resistor R2.When high potential input (Vbus) is higher than LED voltage
During source (Vled), low current can flow through startup resistor R2 to be charged for start-up capacitance device C4.When start-up capacitance device C4 is filled
When point charging to the threshold voltage of bipolar transistor Q1, bipolar transistor Q1 is operated in Bipolar Linear region.Transistor
Conducting can enable low current again through energy stores inductor L1 and feed inductor L2.
Once the voltage at energy stores inductor L1 two ends is set up, between energy stores inductor L1 and the inductor L2 that feeds
Magnetic couplings feed inductor L2 two ends create reflected voltage.For energy stores inductor L1, the terminal with point for just,
And in turn for the inductor L2 that feeds, the terminal with point is for just.The inductor L2 that feeds can be provided and just fed and as electricity
Potential source, and provide current spike by the base stage of start-up capacitance device C4 arrival bipolar transistors Q1 and return to inductor of feeding
L2, i.e., clockwise, so that bipolar transistor is rapidly introduced into zone of saturation.Capacitor value is smaller, and spike is held
The continuous time will be shorter.When bipolar transistor is NPN transistor, positive feed voltage can be applied to the negative of current output terminal
Voltage.Similarly, when bipolar transistor is PNP transistor, positive feed voltage can be negative voltage.In other words, in power
During the conducting of switch, start-up capacitance device C4 be charged to it is negative and it is lower just initial current flow to the base stage of transistor Q1, and
Further speed up the conducting of power switch.
Additionally, low current can reach the base stage of Q1 to continue partially by flyback diode D6 and electric discharge branch resistance device R4
Put Q1.
Increased by the electric current of energy stores inductor L1, and the collector current of bipolar transistor further increases.
Emitter current can be defined as equal to the summation of collector current and base current.When base current (ib) and collector current
(ic) when summation is minimum, the voltage (V of start-up capacitance device C4C4) reach maximum.In other words, when ib+ic is minimum value,
VC4It is maximized.
Further, since ib is less than ic, so the voltage (V of sense resistor R3R3) mainly determined by ic.As ic increases
Plus, VR3Also increase, this causes start-up capacitance device CV4Voltage reduction, and cause that start-up capacitance device C4 being put by D6 and R4
Electric branch discharges.
The increase voltage V at sense resistor two endsR3Can cause that the voltage at the emitter stage of Q1 increases so that base current
(ib) its direction is inverted.In other words, sense resistor be configured as to the current output terminal of transistor provide it is negative feed it is (all
Such as it is used for the positive voltage of npn bipolar transistor), to resist (counter) just feeding (negative voltage) from the inductor L2 that feeds.
Therefore, bear feed (positive voltage) negative electrical charge of the control terminal from power switch can be attracted, with the pass that accelerating power is switched
Close.
The reversion of base current causes that bipolar transistor Q1 initially moves off zone of saturation.Once bipolar transistor Q1 enters again
Enter zone of action, the voltage (Vce) between the collector and emitter of bipolar transistor increases, and collector current (ic) is quick
Decline.
This rapid decrease of collector current can cause that sustained diode 6 is turned on, and at collector current (ic)
Afterflow (freewheel) is carried out to the electric current by energy stores inductor L1 after dropping to zero.Additionally, energy stores inductance
Magnetic couplings between device L1 and the inductor L2 that feeds create the reflected voltage at inductor L2 two ends of feeding.For energy stores electricity
Sensor L1, band point terminal is negative, therefore the band point terminal of the inductor L2 that feeds is negative.The emitter E of power switch Q1 has height
Voltage potential.Therefore, the inductor L2 that feeds can be provided to bear and be fed further to strengthen the closing of power switch.When by energy
When the current reduction of storage inductor L1 is to zero, then subsequent cycle will start.
By this way, increased bipolar transistor emitter pole tension causes that base current inverts its direction, and this causes base
Excess minority carriers in extremely are eliminated or extract to colelctor electrode, therefore help reduce the storage time of bipolar transistor.
With another interpretive mode, with the increase of base current, emitter current increases, and sense resistor R3 two
The voltage at end increases.The countermeasures at R3 two ends are across transistor Q1 by the base-emitter fed or AUX inductors L2 is provided
Voltage Vbe.When the voltage at R3 two ends reaches specified quantitative, the Vbe of Q1 reduction, no electric current flow to base stage, and BJT Q1 from
Saturation state moves to cut-off state.Emitter current is slowly increased, but collector current keeps increasing, because in base stage
Electric charge is drawn into colelctor electrode away from base stage.Because electric charge is drawn, so reducing storage time.Additionally, start-up capacitance device
C4 is discharged by the electric discharge branch formed by D6 and R4.
Now, the current collection of the junction capacitor stored charge on bipolar junction transistor (BJT) Q1, and transistor Q1 two ends
Pole-emitter voltage Vce increases.When the value of Vc increases to specified quantitative, BJT Q1 are closed, and main or main or energy stores
The voltage reversal at inductor (or winding) L1 two ends, and D5 carries out afterflow to the electric current of main winding.Aid in or feed inductor
(or winding) L2 also reflects this voltage change, and causes the emitter voltage of transistor higher than the base voltage of transistor,
Therefore BJT Q1 are oppositely biased, and ensures that Q1 is closed.
It should be understood that this control method implemented on bipolar transistor can use turning in addition to step-down converter
Parallel operation.For example, the method can be used in the such as converter of boosting, buck-boost or flyback converter as power crystalline substance
On the bipolar transistor that body pipe is operated.For example, when step-down converter, the electric current of energy stores inductor L1 is equal to
LED current.Additionally, average current is only the half of peak point current.By controlling the peak point current of inductor, LED current is exported
Can be controlled to produce appropriate constant current control.
Therefore, the arrangements and methods topology for being proposed is presented by its emitter terminal, rather than directly controlling its base
Extreme son drives the new paragon of bipolar transistor.
The voltage at inductor L2 two ends of feeding may be considered reference, because power switch electric current forms sense resistor R3
On to reactance voltage, to resist the voltage at inductor L2 two ends.In superincumbent configuration, due to the electricity at inductor L2 two ends of feeding
The reference of pressure and thus peak point current is proportional to Vbus-Vled, so input current/power switch electric current is shaped to follow
Input voltage.Input waveform shaping can cause the relatively low distortion of line current and produce power factor higher.It should be understood that
Final waveform shape depends on the DC transmission functions of converter；However, Fig. 3 shows the exemplary input for buck topology
Current waveform 201.
Although being shown specifically in the description in accompanying drawing and above and describing the present invention, these are illustrated and description quilt
It is considered illustrative or exemplary and not restrictive；The invention is not restricted to the disclosed embodiments.
Those skilled in the art with reference to the accompanying drawings, the research of open and appended claims putting into practice the process of invention claimed
In be appreciated that and realize to disclosed embodiment other deformation.In the claims, word " including " be not excluded for other yuan
Part or step, and indefinite article " one " is not excluded for multiple.Certain measures are quoted in mutually different dependent claims
Only the fact do not indicate that these measures combination be not useable for make a profit.Any reference symbol in claim should not be explained
It is limitation scope.
Claims (15)
1. a kind of switched mode power converter circuit, including：
Energy stores inductor (L1), coupled to power supply, and by the power source charges or is discharged come to load confession
Electricity；
Power switch (Q1), is adapted to turn on and closes to set the energy stores inductor charge or discharge；
Another inductor (L2), is coupling between the current output terminal of the power switch and ground terminal, another electricity
Sensor and the energy stores inductor magnetic couplings, wherein, another inductor is configured as with the energy stores
Inductor is started to charge up, and applies just to feed to the power switch, so as to accelerate the conducting of the power switch；
Sense resistor (R3), it is another with described between the current output terminal and the ground terminal of the power switch
One inductor series coupled；And
Capacitor (C4), is coupling between the control terminal of the power switch and the ground terminal, and in the power supply
Between the ground terminal.
2. switched mode power converter circuit according to claim 1, wherein, the energy stores inductor is configured
It is, when the power switch is turned in the inductor internal memory energy storage capacity, and to be discharged when the power switch is closed and stored
Energy, another inductor is further configured to be released energy with the energy stores inductor, to the power
Switch is provided to bear and fed, so as to strengthen the closing of the power switch.
3. switched mode power converter circuit according to claim 1 and 2, wherein, the power switch is bipolar crystalline substance
Body pipe, the current output terminal of the power switch is the emitter stage of the bipolar transistor, and the power switch
The control terminal be the bipolar transistor base terminal.
4. switched mode power converter circuit according to claim 1 and 2, wherein, the switch-mode-power conversion
Device includes step-down converter, and the energy stores inductor is coupled in series between the power switch and load, the pole of afterflow two
Pipe is coupling between the energy stores inductor and the load, with when the power switch is closed to being deposited from the energy
The energy of storing up electricity sensor release carries out afterflow,
The capacitor (C4) is coupled to the power supply via the load and current-limit resistor (R2).
5. switched mode power converter circuit according to claim 3, wherein, the power switch is NPN transistor,
And another inductor is coupled to the emitter stage of the power switch at inflow terminal and is coupled at outflow terminal
The first terminal of the sense resistor, another inductor and the energy stores inductor magnetic couplings so that described
Another inductor flow into terminal near the energy stores inductor outflow terminal, and another inductor outflow
Inflow terminal of the terminal near the energy stores inductor.
6. switched mode power converter circuit according to claim 1, also including the electric discharge in parallel with the capacitor
Branch (D6, R4), for allowing the capacitor discharge when the power switch is closed.
7. switched mode power converter circuit according to claim 1 and 2, wherein, the energy stores inductor with
Form this mode and the power switch and light-emitting diodes of boost converter, bust-boost converter or flyback converter
Tube assembly is coupled.
8. a kind of lighting circuit, including：
- switched mode power converter circuit according to any one of claim 1 to 7；And
- light emitting diode is arranged, coupled to the switched mode power converter circuit.
9. a kind of method of utilization switched mode power converter circuit drives electric current, methods described includes：
Energy stores inductor is coupled to power supply, the energy stores inductor is by the power source charges or is discharged
Come to load supplying；
Power switch is turned on and off, to set the energy stores inductor charge or discharge；
Another inductor is coupled between the current output terminal and ground terminal of the power switch；By another inductor
With the energy stores inductor magnetic couplings, wherein, another inductor is configured as with the energy stores inductance
Device is started to charge up, and applies just to feed to the power switch, so as to accelerate the conducting of the power switch；
It is between the current output terminal and the ground terminal of the power switch that sense resistor is another with described
Inductor is coupled in series；
Between the control terminal and the ground terminal of the power switch and the power supply and the ground terminal it
Between coupled capacitor device.
10. method according to claim 9, also includes：When the power switch is turned in the inductor memory storage
Energy, and stored energy is discharged when the power switch is closed；And as the energy stores inductor discharges
Energy, provides to the power switch and is fed from the negative of another inductor, so as to strengthen the closing of the power switch.
11. method according to claim 9 or 10, wherein, the power switch is bipolar transistor, the power switch
Current output terminal can be the bipolar transistor emitter stage, and the control terminal of the power switch can be with
It is the base terminal of the bipolar transistor.
12. method according to claim 9 or 10, wherein, the switched mode power converter circuit can be step-down
Converter, methods described may further include：
The energy stores inductor is coupled in series between the power switch and load；
Fly-wheel diode is coupled between the energy stores inductor and the load, with when the power switch is closed pair
Afterflow is carried out from the energy of energy stores inductor release；And
The capacitor is coupled to the power supply via the load and current-limit resistor.
13. methods according to claim 11, wherein, the power switch is NPN transistor, and methods described bag
Include：
Another inductor (L2) is coupled to the emitter stage of the power switch at inflow terminal, and in outflow terminal
Another inductor (L2) is coupled to the first terminal of the sense resistor (R3) at place；And wherein
Another inductor is set to be further included with the energy stores inductor magnetic couplings：Position another inductor
Flow into outflow terminal of the terminal near the energy stores inductor, and position the outflow terminal of another inductor and lean on
The inflow terminal of the nearly energy stores inductor.
14. methods according to claim 9, also include：The electric discharge branch in parallel with the capacitor is provided, to allow
Capacitor is stated to be discharged when the power switch is closed.
15. method according to claim 9 or 10, including：Make the energy stores inductor and the power switch and
Light-emitting diode component is coupled, to form the one kind in boost converter, bust-boost converter or flyback converter.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNPCT/CN2014/084740 | 2014-08-19 | ||
| CN2014084740 | 2014-08-19 | ||
| EP14187665 | 2014-10-03 | ||
| EP14187665.6 | 2014-10-03 | ||
| PCT/EP2015/068793 WO2016026792A1 (en) | 2014-08-19 | 2015-08-14 | Switched mode power converter circuit and method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106717116A true CN106717116A (en) | 2017-05-24 |
Family
ID=54252242
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201580044296.XA Pending CN106717116A (en) | 2014-08-19 | 2015-08-14 | Switched mode power converter circuit and method |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US20170265261A1 (en) |
| EP (1) | EP3183942A1 (en) |
| CN (1) | CN106717116A (en) |
| WO (1) | WO2016026792A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111165075A (en) * | 2017-08-01 | 2020-05-15 | 克莱沃内斯公司 | Intelligent switch equipment and central control system thereof |
| CN112092727A (en) * | 2020-09-16 | 2020-12-18 | 广州小鹏汽车科技有限公司 | Backlight drive circuit and vehicle |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10827585B1 (en) | 2019-04-17 | 2020-11-03 | Goodrich Lighting Systems, Inc. | Driving light emitting diodes and display apparatus |
| CN211063818U (en) * | 2019-07-25 | 2020-07-21 | 漳州立达信光电子科技有限公司 | L ED lamp |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4316242A (en) * | 1980-09-04 | 1982-02-16 | General Electric Company | Wide input range, transient-immune regulated flyback switching power supply |
| GB2088655A (en) * | 1980-11-18 | 1982-06-09 | Standard Telephones Cables Ltd | Switched mode power supplies |
| WO1998011659A1 (en) * | 1996-09-12 | 1998-03-19 | Thomson Consumer Electronics, Inc. | Self oscillating proportional drive zero voltage switching power supply |
| US20050162872A1 (en) * | 2004-01-26 | 2005-07-28 | Mitsumi Electric Co. Ltd. | DC/DC converter including a zener diode having a substantially zero temperature coefficient |
-
2015
- 2015-08-14 EP EP15775092.8A patent/EP3183942A1/en not_active Withdrawn
- 2015-08-14 WO PCT/EP2015/068793 patent/WO2016026792A1/en active Application Filing
- 2015-08-14 US US15/504,813 patent/US20170265261A1/en not_active Abandoned
- 2015-08-14 CN CN201580044296.XA patent/CN106717116A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4316242A (en) * | 1980-09-04 | 1982-02-16 | General Electric Company | Wide input range, transient-immune regulated flyback switching power supply |
| GB2088655A (en) * | 1980-11-18 | 1982-06-09 | Standard Telephones Cables Ltd | Switched mode power supplies |
| WO1998011659A1 (en) * | 1996-09-12 | 1998-03-19 | Thomson Consumer Electronics, Inc. | Self oscillating proportional drive zero voltage switching power supply |
| US20050162872A1 (en) * | 2004-01-26 | 2005-07-28 | Mitsumi Electric Co. Ltd. | DC/DC converter including a zener diode having a substantially zero temperature coefficient |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111165075A (en) * | 2017-08-01 | 2020-05-15 | 克莱沃内斯公司 | Intelligent switch equipment and central control system thereof |
| CN112092727A (en) * | 2020-09-16 | 2020-12-18 | 广州小鹏汽车科技有限公司 | Backlight drive circuit and vehicle |
Also Published As
| Publication number | Publication date |
|---|---|
| US20170265261A1 (en) | 2017-09-14 |
| WO2016026792A1 (en) | 2016-02-25 |
| EP3183942A1 (en) | 2017-06-28 |
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